Moles, Molecules, and Grams Worksheet Answer Key

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3 Moles, Molecules, and Grams Worksheet Answer Key 1) How many are there in 24 grams of FeF 3? 1.28 x ) How many are there in 450 grams of Na 2 SO 4? 1.91 x ) How many grams are there in 2.3 x atoms of silver? 421 grams 4) How many grams are there in 7.4 x of AgNO 3? 209 grams 5) How many grams are there in 7.5 x of H 2 SO 4? 122 grams 6) How many are there in 122 grams of Cu(NO 3 ) 2? 3.92 x ) How many grams are there in 9.4 x of H 2? 312 grams 8) How many are there in 230 grams of CoCl 2? 1.07 x ) How many are there in 2.3 grams of NH 4 SO 2? 1.69 x ) How many grams are there in 3.3 x of N 2 I 6? 430 grams 11) How many are there in 200 grams of CCl 4? 7.82 x ) How many grams are there in 1 x of BCl 3? 195 grams 13) How many grams are there in 4.5 x of Ba(NO 2 ) 2? 17.1 grams 14) How many are there in 9.34 grams of LiCl? 1.33 x ) How many grams do 4.3 x of UF 6 weigh? 2.51 grams 16) How many are there in 230 grams of NH 4 OH? 3.96 x Cavalcade Publishing All Rights Reserved For chemistry help, visit

5 Worksheet Mole Conversions Name: I. Practice Problems A. What is the mass of 1 mole (molar mass) of: Answers in g/mole 1. H Mg(OH) CO NH 4 Cl CuSO AgNO B. Convert from grams to moles, or moles to grams 1. How many moles is 12.5 g of magnesium hydroxide?.214 moles 2. How many moles is 1.46 g of hydrogen gas (H 2 )?.724 moles 3. How many grams are in 4.3 moles of ammonium chloride? 230 grams C. Convert from moles to, or to moles 1. How many are in 2.0 moles of hydrogen gas (H 2 )? x How many moles is 2.0 x of silver nitrate? 33.2 moles D. How many atoms of oxygen are in 2.4 x of copper(ii) sulfate? 9.6 x10 23 atoms of oxygen II. Application Problems A. How many are in 96 g of carbon dioxide? 1.31x10 24 B. How many oxygen atoms are in 96 g of CO 2? x10 24 atoms C. How many grams would 1.0 x of copper(ii) sulfate weigh? 2650 grams D. How much does each individual molecule of copper(ii) sulfate weigh? amu s

6 Mole Calculation Worksheet Answer Key 1) How many moles are in 15 grams of lithium? 0.46 moles 2) How many grams are in 2.4 moles of sulfur? 77.0 grams 3) How many moles are in 22 grams of argon? 0.55 moles 4) How many grams are in 88.1 moles of magnesium? 2141 grams 5) How many moles are in 2.3 grams of phosphorus? moles 6) How many grams are in 11.9 moles of chromium? grams 7) How many moles are in 9.8 grams of calcium? 0.24 moles 8) How many grams are in 238 moles of arsenic? 17,826 grams What are the molecular weights of the following compounds? 9) NaOH 40.1 grams 12) H 3 PO grams 10) H 2 O 18.0 grams 13) Mn 2 Se grams 11) MgCl grams 14) (NH 4 ) 2 SO grams 15) How many grams are in 4.5 moles of sodium fluoride, NaF? 189 grams 16) How many moles are in 98.3 grams of aluminum hydroxide, Al(OH) 3? 1.26 moles 17) How many grams are in 0.02 moles of beryllium iodide, BeI 2? 5.2 grams 18) How many moles are in 68 grams of copper (II) hydroxide, Cu(OH) 2? 0.70 moles 19) How many grams are in 3.3 moles of potassium sulfide, K 2 S? grams 20) How many moles are in 1.2 x 10 3 grams of ammonia, NH 3? 70.6 moles 21) How many grams are in 2.3 x 10-4 moles of calcium phosphate, Ca 3 (PO 3 ) 2? grams 22) How many moles are in 3.4 x 10-7 grams of silicon dioxide, SiO 2? 5.66 x 10-9 moles 23) How many grams are in 1.11 moles of manganese sulfate, Mn 3 (SO 4 ) 7? grams 2000 Cavalcade Publishing All Rights Reserved For chemistry help, visit

8 Mass and Moles Worksheet - Answers 1. How many moles in 34.2 g of sulfur? 1.07 mol S 2. How many grams in 1.20 moles of carbon? 14.4g C 3. How many atoms in 3.91 moles of sodium? 2.35 x atoms Na 4. How many atoms in moles of strontium? 2.72 x atoms Sr 5. How many in 31 g of chlorine gas? 2.6 x Cl 2 6. How many nitrogen atoms in 3.4 moles of ammonia? 2.0 x atoms N 7. What mass would 4.52 x of water have? 135g H 2 O 8. How many oxygen atoms in 2.3 x 10-8 g of oxygen? 8.7 x atoms O 9. How may atoms in 1.00 ounce of pure gold? 8.65 x atoms Au 10. How many sugar (C 12 H 22 O 11 ) could you make from 1.0 pound of carbon? 1.9 x C 12 H 22 O What is the mass of 4.00 moles of sugar? 1370g sugar 12. How many moles of sulfate ions would be released if 2.5 moles of aluminum sulfate were dissolved in water? 7.5 mol SO What is the mass of 1.2 x 10-3 moles of sodium chloride? 0.070g NaCl 14. How many formula units of NaCl are there in 3.55 x 10-6 g of salt? 3.65 x formula units NaCl 15. How many Volkswagons are there in 2 moles of Volkswagons? 1 x VW s

SCH 4C1 Unit 2 Problem Set Questions taken from Frank Mustoe et all, "Chemistry 11", McGraw-Hill Ryerson, 2001 1. A small pin contains 0.0178 mol of iron. How many atoms of iron are in the pin? 2. A sample

Balancing Chemical Equations Worksheet Student Instructions 1. Identify the reactants and products and write a word equation. 2. Write the correct chemical formula for each of the reactants and the products.

35 MOLES ND MOLE CLCULTIONS INTRODUCTION The purpose of this section is to present some methods for calculating both how much of each reactant is used in a chemical reaction, and how much of each product

CHEMISTRY DISCOVER UNIT 5 LOTS OF PRACTICE ON USING THE MOLE!!! PART 1: ATOMIC MASS, FORMULA MASS, OR MOLECULAR MASS 1. Determine the atomic mass, formula mass, or molecular mass for each of the following

Chapter 5 - Molecules and Compounds How do we represent molecules? In pictures In formula In name Ionic compounds Molecular compounds On the course website, you will find a list of ions that I would like

1 MOLECULAR MASS AND FORMULA MASS Molecular mass = sum of the atomic weights of all atoms in the molecule. Formula mass = sum of the atomic weights of all atoms in the formula unit. 2 MOLECULAR MASS AND

AP Chem Summer Assignment Worksheet #1 Atomic Structure 1. a) For the ion 39 K +, state how many electrons, how many protons, and how many 19 neutrons are present? b) Which of these particles has the smallest

Chapter 3 Mass Relationships in Chemical Reactions Student: 1. An atom of bromine has a mass about four times greater than that of an atom of neon. Which choice makes the correct comparison of the relative

Skills Worksheet Problem Solving Mole Concept Suppose you want to carry out a reaction that requires combining one atom of iron with one atom of sulfur. How much iron should you use? How much sulfur? When

Monatomic Ions Ions are atoms that have either lost or gained electrons. While atoms are neutral, ions are charged particles. A loss of electrons results in a positive ion or cation (pronounced cat-eye-on

Activity One: Binary Ionic Compounds Composed of Main Group Elements This activity focuses on the nomenclature rules for ionic compounds composed of two different elements from select groups on the periodic

Instructions for Conversion Problems For every conversion problem Write the number in the problem down with unit and a multiplication sign Decide which conversion factor you should use, Avagadro s or molar

Introduction Learning Guide 3A Salts Chem 1010 Look at the samples in the two bottles you were given. What observations can you make about them? A: B: If you could look at them more closely, here's what

HOMEWORK 4A Oxidation-Reduction Reactions 1. Indicate whether a reaction will occur or not in each of following. Wtiring a balcnced equation is not necessary. (a) Magnesium metal is added to hydrochloric

TEKS REVIEW 8B Calculating Atoms, Ions, or Molecules Using Moles TEKS 8B READINESS Use the mole concept to calculate the number of atoms, ions, or molecules in a sample TEKS_TXT of material. Vocabulary

Name: Chemistry Post-Enrolment Worksheet The purpose of this worksheet is to get you to recap some of the fundamental concepts that you studied at GCSE and introduce some of the concepts that will be part

Stoichiometry Review There are 20 problems in this review set. Answers, including problem set-up, can be found in the second half of this document. 1. N 2 (g) + 3H 2 (g) --------> 2NH 3 (g) a. nitrogen

WRITING CHEMICAL FORMULA For ionic compounds, the chemical formula must be worked out. You will no longer have the list of ions in the exam (like at GCSE). Instead you must learn some and work out others.

Skills Worksheet Problem Solving Percentage Composition Suppose you are working in an industrial laboratory. Your supervisor gives you a bottle containing a white crystalline compound and asks you to determine

9 CHEMICAL NAMES AND FORMULAS SECTION 9.1 NAMING IONS (pages 253 258) This section explains the use of the periodic table to determine the charge of an ion. It also defines polyatomic ion and gives the

Description of the Mole Concept: Suppose you were sent into the store to buy 36 eggs. When you picked them up you would get 3 boxes, each containing 12 eggs. You just used a mathematical device, called

How much does a single atom weigh? Different elements weigh different amounts related to what makes them unique. What units do we use to define the weight of an atom? amu units of atomic weight. (atomic

Example Exercise 9.1 Atomic Mass and Avogadro s Number Refer to the atomic masses in the periodic table inside the front cover of this textbook. State the mass of Avogadro s number of atoms for each of

Nomenclature Packet Worksheet I: Binary Ionic Compounds (representative metals) metals from groups 1A, 2A, and 3A (1, 2, and 13) have constant charges as ions and do NOT get Roman Numerals in their names

Introduction to Chemistry Exam 2 Practice Problems 1 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1.Atoms consist principally of what three

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In the previous section, you learned how and why atoms form chemical bonds with one another. You also know that atoms combine in certain ratios with other atoms. These ratios determine the chemical formula

Chapter 1: Moles and equations 1 Learning outcomes you should be able to: define and use the terms: relative atomic mass, isotopic mass and formula mass based on the 12 C scale perform calculations, including

Topic 4 National Chemistry Summary Notes Formulae, Equations, Balancing Equations and The Mole LI 1 The chemical formula of a covalent molecular compound tells us the number of atoms of each element present

Molecular Formula: Example A compound is found to contain 85.63% C and 14.37% H by mass. In another experiment its molar mass is found to be 56.1 g/mol. What is its molecular formula? 1 CHAPTER 3 Chemical

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The Mole Atomic mass units and atoms are not convenient units to work with. The concept of the mole was invented. This was the number of atoms of carbon-12 that were needed to make 12 g of carbon. 1 mole

Chapter 7 Answers and Solutions 7 Answers and Solutions to Text Problems 7.1 A mole is the amount of a substance that contains 6.02 x 10 23 items. For example, one mole of water contains 6.02 10 23 molecules

1. How many iron atoms are present in one mole of iron? Ans. 6.02 1023 atoms 2. How many grams of sulfur are found in 0.150 mol of sulfur? [Use atomic weight: S, 32.06 amu] Ans. 4.81 g 3. How many moles

Name Writing and Balancing Chemical Equations Period When a substance undergoes a chemical reaction, chemical bonds are broken and new bonds are formed. This results in one or more new substances, often

Instructor: Nicole Stevens 1 of 8 Winter 2008 1. Which of the following is a chemical property? a. density d. boiling point b. color e. odor c. reactivity with water f. all of these are chemical properties

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Name: Exam 2 Chemistry 65 Summer 2015 Score: Instructions: Clearly circle the one best answer 1. Valence electrons are electrons located A) in the outermost energy level of an atom. B) in the nucleus of

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The Mole 6.022 x 10 23 Background: atomic masses Look at the atomic masses on the periodic table. What do these represent? E.g. the atomic mass of Carbon is 12.01 (atomic # is 6) We know there are 6 protons

Aqueous Solutions and Solution Stoichiometry Water is the dissolving medium, or solvent. Some Properties of Water Water is bent or V-shaped. The O-H bonds are covalent. Water is a polar molecule. Hydration